Tree Support Misalignment when Importing from Meshmixer

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I am having a difficult time with tree supports generated and exported from Meshmixer. I painstakingly generated them on this complex model with the hope of importing them into Cura. I brought my support in, then imported the model itself and zero it out. However, I just can't get the two to align such that the tip of the supports is touching the model. It is always offset by what looks like a millimeter or so.

Just the supports in Cura (does the striping mean something is wrong?)

Both in Cura:

Closeup demonstrating the support offsets:

How do I ensure the supports line up correctly?

Also, a follow-up question: The plan was to use ABS for the main and HIPS for the support, or one kind of PLA for the main and another (cheaper) kind for the support, so that it's easier to see what to remove on a model like this. Curious if anyone has thoughts on whether it's better to just better to disable Extruder 2 and print all with the same material for a complex model.

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Designing for light-weight parts is becoming more important, and I’m a firm believer in the need to produce lighter weight, less over-engineered parts for the future. This is for sustainability reasons because we need to be using less raw materials and, in things like transportation, it impacts the energy usage of the product during it’s service life.